The technical principle analysis and application of the MINIMATCH framework in the Java library
Minimatch is a pattern -based string matching tool, which can achieve simple matching matching.Applications in the Java class library are widely used, especially scenarios involving file search and path matching.This article will analyze the technical principles of the Minimatch framework in the Java class library and provide some related Java code examples.
1. Analysis of the technical principles of minimatch
Minimatch uses a simple and powerful pattern matching algorithm, using the through -matching strings to match.The passing charts can include the following:
1. '*': The characters (including 0 characters) that match any number of matching.
2. '?': Express a character.
3. '[abc]': indicate any character in the matching square bracket.
4. [A-Z] ': Indicates any character that matches A to the z range.
5. '!': Expost in the brackets, that is, it matches any character except the characters in the bracket.
The matching algorithm of Minimatch is mainly divided into two steps. First, the pattern string is parsed into a matching tree, and then compares the string to be matched with the matching tree.
1. Analysis mode string: Treat the matching mode string to analyze it and convert it into a matching tree.The matching tree is a data structure composed of nodes. Each node represents part of a pattern string, and contains the matching rules of this part.
2. Comparison of string to be matched: Compare the string to match with the matching tree.Start with the root nodes of the matching tree, compare the characters one by one according to the matching rules of the node. If the matching is successful, it will continue to traverse the next node until all nodes or matching failure.If all nodes match successfully, it means that the string matching is successful.
2. The application of Minimatch in the Java library
MINIMATCH's Java class library provides some practical methods, which can be used in file search and path matching scenes.
1. File search: You can use minimatch to search for files, and match the file name according to the specified mode string.For example, the files that can be used in the specified directory through the following code can be used to the file with ".txt" as the suffix:
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
public class FileSearch {
public static List<File> searchFiles(String directory, String pattern) {
List<File> result = new ArrayList<>();
File dir = new File(directory);
File[] files = dir.listFiles();
for (File file : files) {
if (Pattern.matches(pattern, file.getName())) {
result.add(file);
}
}
return result;
}
public static void main(String[] args) {
String directory = "/path/to/directory";
String pattern = ".*.txt";
List<File> files = searchFiles(directory, pattern);
for (File file : files) {
System.out.println(file.getAbsolutePath());
}
}
}
2. Path matching: You can use minimatch to match the path, and according to the specified mode string matching path name.For example, the path that can be matched with "/src/main/java" through the following code:
import java.util.regex.Pattern;
public class PathMatcher {
public static boolean matchPath(String path, String pattern) {
String[] parts = path.split("/");
String[] patterns = pattern.split("/");
int i = 0;
int j = 0;
while (i < parts.length && j < patterns.length) {
if (!Pattern.matches(patterns[j], parts[i])) {
return false;
}
i++;
j++;
}
return i >= parts.length && j >= patterns.length;
}
public static void main(String[] args) {
String path = "/src/main/java/com/example/Main.java";
String pattern = ".*src.*java.*";
boolean match = matchPath(path, pattern);
System.out.println(match);
}
}
The above is the analysis and application of the technical principles of the MINIMATCH framework in the Java library.By using Minimatch, it can easily match the pattern matching of the string to implement functions such as file search and path matching.It is hoped that this article can help readers better understand and apply the Minimatch framework.
